package ten;

interface Selector{
	boolean end();
	Object current();
	void next();
}


public class Sequence {
	private Object[] items;
	private int next = 0;
	public Sequence(int size){items = new Object[size];}
	public void add(Object x){
		if (next<items.length) {
			items[next++]=x;
		}
	}
	
	private class SequenceSelector implements Selector{
		private int i=0;
		public boolean end() {
			return i== items.length;
		}
		public Object current() {
			return items[i];
		}

		public void next() {
			if(i<items.length)i++;
		}
	}
	
	public Selector selector(){
		return new SequenceSelector();
	}
	
	public static void main(String[] args) {
		Sequence sequence = new Sequence(10);
		for (int i = 0; i <10; i++) {
			sequence.add(Integer.toString(i));
		}
		Selector selector = sequence.selector();
		while (!selector.end()) {
			System.out.println(selector.current()+" ");
			selector.next();
		}
	}

}

















